Most people who use the Sony A7s, A7R, or other Sonys in the same group have sooner or later got annoyed that the recordings stops after 30 minutes of continuous recording. A smart guy has created a app that overrides this problem. I installed the app and tested this on my Sony A7r II for shooting an insect hatch. The camera was recording 4k files for 5 days with a 256GB SDX card that was swapped and formatted every 5.5 hours. No problems. Nor with overheating. The camera was hooked up to a 2.3A 5V USB adapter via a battery adapter.